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| 型號(hào)： | C500 |
| 廠商： | SIEMENS AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit Microcontroller(8位微控制器) |
| 中文描述： | 8位微控制器（8位微控制器） |
| 文件頁數(shù)： | 8/55頁 |
| 文件大?。?/td> | 495K |
| 代理商： | C500 |
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AP242401 04.99
Ceramic Resonator Oscillators of the
C500 / C166 Microcontroller Family
3
Oscillator-Inverter
The microcontrollers of the C500/C166 Family include the active part of the oscillator (also called
oscillator-inverter). Based on the history and evolution of the microcontrollers there are different
oscillator-inverters implemented in the C500/C166 Family members. Due to the same reason, the
meaning of XTAL1 and XTAL2 pins is different. In this Application Note and at the C166 Family,
XTAL1 is the oscillator-inverter input while XTAL2 is the output. At the C500 Family it is
recommended to have a closer look to the Data Sheet of each device.
The on-chip oscillator-inverter can either run with an external ceramic resonator and appropriate
external oscillator circuitry (also called passive part of the oscillator) or it can be driven by an
external oscillator. The external oscillator directly connected to XTAL1, leaving XTAL2 open, feeds
the external clock signal to the internal clock circuitry.
The oscillator input XTAL1 and output XTAL2 connect the internal CMOS Pierce oscillator to the
external ceramic resonator. The oscillator provides an inverter and a feedback element. The
resistance of the feedback element is in the range from 0.5 to 1 M
.
Depending on the type of oscillator-inverter the gain can be different during and after reset.
The appendix gives separate recommendations for each oscillator-inverter type.
3.1
Oscillator-Inverter of the C500 Family
Based on the history and increasing CPU frequency there are many different oscillator-inverter
types. The oscillator-inverter types differ in gain and frequency. The gain of these types of
oscillator-inverters is the same during reset active and reset inactive. These oscillators are
optimized for operating frequencies in the range from 2.0 (3.5) to 20 (40) MHz. For details refer to
the appendix or Data Sheets.
3.2
Oscillator-Inverter of the C166 Family
The oscillator-inverters of the C166 Family are distinguished in groups of standard oscillator-
inverters for frequencies up to 40 MHz, Low Power oscillator-inverters for low power consumption
and Real Time Clock oscillator-inverters for a frequency range of 32.768 kHz
±
50%.
3.2.1 Oscillator-Inverter Type_R
This type of inverter is implemented in most of the current C166 Family derivatives. The gain of the
Type_R oscillator-inverter is high during reset is active and is
R
educed by one-third when reset is
inactive. This feature provides an excellent start-up behavior and a reduced supply current for the
oscillator during normal operation mode. The Type_R oscillator-inverter is optimized for an
operating frequency range of 3.5 to 40 MHz.
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